Cushioning device for presses



Sept. 23, 1930. 0135 1,776,271

cusmonme DEVICE FOR PRESSIJS 1 21196, Jan. 30, 1929 2 ShQB tS-ShOGt 1 Sept. 23, 1930. F. J. RODEZ 1,776,271

' CUSHIONING DEVICE FOR PRESSES Filed Jan. 30. 1929 2 Shook-Shoat 2 j ummw I leg Patented Sept. 23, 1930 UNITED STATES PATENT OFFICE FRIEDRICH J. RODE, OF CHICAGO, ILLlI NOIS, ASSIGNOR TO M ARQU ETTE TOOL & MFG.

COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS I CUSHIONING DEVICE non rnnssns Application filed January 30, 1929. Serial No. 336,302.

Cushioning devices for presses, and particularly sheet metal presses, usually comprise a pressure pad commonly known as a pin plate for the reason that pins which support one of the die members, or one of the work holding elements, pass loosely through the bed or bolster plate of the rest upon the pad.

The pad is forced downwardly during the formation of the work and is resisted in its movement in one direction by means of a cushion which may be hydraulic, pneumatic, a combination of the two, or resiliently yieldmg means such as springs or an elastic element.

After the work has been formed andthe ram carrying the movable die ascends, the pressure pad and the element supported thereby are returned'to their normal positions and the pad has usually been arrested in its return movement by abutting the bottom of the bolster plate. As the pad is sometimes returned with considerable pressure it will strike the bolster plate with considerable force, and at other times the pressure in. the

cushion will hold the pad against the bottom of the bolster causing a considerable strain to be exerted upon the bolts or fastening devices by means of which the bolster plate is secured to the bed of the press, with the result that such fastening means or bolts become stretched, and with the further result that the bolster plate and the mechanism or parts supported thereby will become loose, all of which is very objectionable'and undesirable.

It is one of the objects of the present inven tion to overcome all of these diflicultics and objections and to provide improved means for arresting the pad at the limit of its return movement at a point where it will not strike or rest against the'bolster plate, and also for maintaining the pad out of contact therewith, thereby relieving the bolster plate from all strains or stresses exerted by the cushioning At the same time there will be provided a space between the pad and bottom of the bolster plate into which chips, punchings or foreign particles may fall so that they will not interfere with the operation of the pad To the attainment of these ends and the acmachine and is supported complishment of other new and useful objects as will appear, the invention consists in the features of novelty in substantially the construction, combination the several parts hereinafter more fully described and claimed and shown in the accompanylng drawings illustrating this invention and in which i Figure 1 is a front elevation, partly in Section, of a sheet metal press constructed in accordance wih the principles of this invention. Figure 2 is a detail sectional view taken on line 22, Figure 1, showing the pad or pin plate arrested at the limit of its upward movement. Figure 3 is a view similar to Figure 2, showing the parts in another osition. Referring more particularly to the drawings the numeral 10 designates generally the bed plate of a press, 11 the uprights, 12 a reciprocable ram, 13 a reciprocable die connected with the ram, 14 a'bolster plate which is secured to the bed 10 of the press by means of fastening devices or bolts 15, and upon which bolster plate is mounted a die 16 which by means of pins 17 passing loosely through the bolster plate 14 and which pins 17 engage and rest upon a pin plate or and arrangement of pad 18. All of the above referred to parts are of the ordinary and well known construction.

Supported beneath thebed of the press, preferably by means of hangers 19, is a support 20 of any desired configuration and mounted upon the support 20 are cushioning devices 21, in the present form of the invention being shown as cylinders to which fluid under pressure is supplied'from any suitable iston rods ing devices I vided for arresting the pad at any predetermined point before it strikes the bolster plate 14.

In the present form of this invention such means embodies rods or bars 25, any number of which may be provided. One end of these rods are secured to the pad or plate 18, preferably by means of nuts or collars 26 arranged in suitable recesses 27 opening through the top of the pad. Closures 28 may be provided for the recesses 27 so thatthe area of the upper surface of the pad 18 against which the pins 17 rest will not be interrupted and will form an extended surface for the pins.

These rods 25 pass loosely through the supv port 20, and connected to the rods below the support 20 are collars 29 which may be adjustably held in position, if desired, by means of nuts or collars 3O engaging threaded extremities 31 of the rods 25.

These collars 29 and nuts 30 may be so adjusted that the pad 18 will be arrested in its return movement at any the bolster plate 14.

It will therefore be manifest that when the pad 18 is being returned it will be prevented from striking the bolster plate. with the result that no stress or strain will be exerted upon the fastening devices 15, and with the further result that the pad will always be spaced below the bolster plate when the pad is at the limit of its upward movement, thereby providing a space between the bolster plate and the pad into which foreign particles, chips or punchings may fall so that the for eign particles will not interfere with the return of the pad and will not be forced by the pad against the bottom of the bolster plate.

While the preferred form of the invention has been herein shown and described, it is to be understood that various changes may be made in the details of construction and in the combination and arrangement of the several parts,within the scope of the claims, without departing from the spirit of this invention.

What is claimed as new is 1. In a press a bolster plate, a pressure pad disposed therebelow and movable away from and toward said plate, cushioning means for resisting the movement of the pad in a direction away from said plate, and means embodying a stationary stop device for arresting the return movement of the pad bedesired point below fore the pressure of the pad is exerted upon said bolster plate. I

2. In a press a bolster plate, a pad therebelow and movable away from and towards the plate, means for moving the pad towards the plate,.rods depending from and movable with the pad, stationary guides through which the rods freely pass, and shoulders on the rods adapted to contact the guides to arrest the movement of the pad towards the plate and for preventing the stress of the last said movement of the pad from being exerted upon said plate.

In testimony whereof I have signed my name to this specification, on this 25th day of January, A. D. 1929.

FRIEDRICH J. RODE. 

